A sketch is a simple rough drawing that is made
rapidly and without much detail. Sketches may take
many forms—from a simple pictorial presentation to
a multi-view orthographic projection.

Just as aircraft technicians need not be highly skilled
in making drawings, they need not be accomplished
artists. However, in many situations, they will need to
prepare a drawing to present an idea for a new design,
a modification, or a repair method. The medium of
sketching is an excellent way of accomplishing this.

The rules and conventional practices for making
mechanical drawings are followed to the extent that
all views needed to portray an object accurately are
shown in their proper relationship. It is also necessary
to observe the rules for correct line use [Figures 2-23
and 2-24] and dimensioning.